sequential es2015 promises

seqential-promises.js

'use strict';

var _ = require('underscore')._;

function promiseFactory (n) {
    return function () {
	return new Promise((resolve) => {
	    setTimeout(_.partial(resolve, n), 1000);
	});
    };
}

function wrap (promiseFn) {
    return function (results) {
	return promiseFn()
	.then(result => {
	    console.log(result);
	    results.push(result);
	    return results;
	});
    };
}

var wrappedFns = _.map(_.times(10, promiseFactory), wrap);
_.reduce(wrappedFns, (cur, next) => {
    return cur.then(next);
}, Promise.resolve([]))
.then(console.log);